import User.Userjson;
import org.apache.http.HttpRequest;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "loginFilter")
public class loginFilter implements javax.servlet.Filter {
    public void destroy() {
    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request=(HttpServletRequest) req;
        HttpServletResponse response=(HttpServletResponse) resp;
        HttpSession session=request.getSession(true);
        String token=req.getParameter("token");
        if(session.getAttribute("denglu")==null){
            if(token==null) {
                response.sendRedirect("https://cas.dgut.edu.cn?appid=javaee&state=STATE");
            }
            else chain.doFilter(req,resp);
        }
        else chain.doFilter(req,resp);

    }

    public void init(FilterConfig config) throws ServletException {

    }

}
